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SyntaxKindEqualityComparer.cs
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SyntaxKindEqualityComparer.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
namespace Microsoft.CodeAnalysis.CSharp
{
public static partial class SyntaxFacts
{
private sealed class SyntaxKindEqualityComparer : IEqualityComparer<SyntaxKind>
{
public bool Equals(SyntaxKind x, SyntaxKind y)
{
return x == y;
}
public int GetHashCode(SyntaxKind obj)
{
return (int)obj;
}
}
/// <summary>
/// A custom equality comparer for <see cref="SyntaxKind"/>
/// </summary>
/// <remarks>
/// PERF: The framework specializes EqualityComparer for enums, but only if the underlying type is System.Int32
/// Since SyntaxKind's underlying type is System.UInt16, ObjectEqualityComparer will be chosen instead.
/// </remarks>
public static IEqualityComparer<SyntaxKind> EqualityComparer { get; } = new SyntaxKindEqualityComparer();
}
}